Link dog for sawmill carriages



June 22 1926.

F. E. MARTIN LINK DOG FOR SAWMILL CARRIAGES I Original Filed Nov. 25, 1921 2 Sheets-Sheet 1 lwwnbd'c 9 LR Marika June 22 1926 F. E. MARTIN LINK DOG FOR SAWMILL CARRIAGES Original iled Nov, 25, 1921 2 Sheets-Sheet Qm F1 4145 I QM \N Patented June 22, 1926.

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FREDERICK E. MARTIN, on WEED, CALIFORNIA, Assrdnon 'ro MARTIN AIR Doe COMPANY, or sen rnnnorsoo, cs'rirronnrn, A CORPORATIQN or CALIFORNIA.

LINK DOG FOR SAEVMTLL CARRIAG-ES.

Original application filed November 1921, Serial No. 5175M. Divided. and tliis'applicati'on filed This invention is directed to dogging means for use in connection with saw mill carriages.

It is well known that the logs on saw mill carriages have a tendency toward endwise movement, notwithstanding the dogs heretolore employed under the sudden stopping of" the carriage in its return movement, this tendency particularly in heavy logs being at times suflicient to distort the usual holding dogs.

The present invention is directed broadly to means designed to overcome this tendency of the log to endwise movement, with such means designed to engage the underside of the log, preferably between the knees, with such dogging means having. an ellective range between the line of the knees and the line of operation ofthe saw.

More specifically, the invention relates to a saw mill dogor dogs' mounted and positioned on the carriage to engage the underside of a log in advance of the knee line, with such dog or dogs operable at will to bite into the underside of the log to prevent it moving endwise following or during carriage movement, and to this specific extent this application is-in part a division of my co-pending application filed November 25, 1921-, Serial No. 517,647. 1

It is further important in an under 10g dogging means that it be capable of cooperation with the log in all positions of the knees and yet not project beyond the saw line to interfere with the operation of the saw, and as the knees and therefore the log must be adjusted on the carriage during the successive sawing operations, the desirable type of under log doggingmeans must be capable of movement at the time the knees are moved, to maintain an effective engage ment with the underside of the log in all positions of the knees. 7

Therefore, the present invention further comprehends under log dogging means, which are advanced or 'retra'cted at the time the-knee or kneesis or: are moved for'the ad.-

justment of the; log, with such dogging. means prevented from extending over thesaw line: in any operativepositionthereof. The invention, in the pre-t'erredand modithe accompanying drawings, in which":

1922, Serial No. 604,062.

Renewed May 4, 1926.

Fig, 1 is'a plan view showing conventionally a saw mill carriage having the improved under log doggingmeans connected therewith.

Fig. 2 is a side-elevation illustrating more particularly the relation of the under log dogging means and carriage, and showing the means for operating the under log-dogging means.

Fig. 5 is a perspective view of one" of the links of said dogging means.

Fig. 6 1s a longitudinal'sectlon of a slightly modified form of under log dogging means.

Fig. 7 1s a perspective View of another form or under log dogging means.

A saw mill carriage l is'l iere conventionally shown, having knees 2 provided with the usual dogs 3 for engaging the log, The under log dogging means of the present invention comprises a frame 4: mounted at its rear end upon a pivot pin 5, supported ina bracket 6, which in turn is secured to and supported on one of the intermediate rails"? of the carriage. The frame 4 extends for wardly from the carriage in a plane in parallelism with the knees, and terminates at its forward end inwardly of the saw line relative to the carriage. The traineis preferably mounted on the carriage at a point between the knees, but no limitation is intended in this application either with regard to the specific location of the under log dogging means, or as to the number of such.

means as may be employed in connection with any particular carriage;

The frame 4 comprises spaced parallel side plates 8,,the extreme upper edgesof which-are formed to present a biting edge 9, and the' extreme forward upper ends'of which presentengaging or biting projections '10. The innersurtacesof" the 8 are torineclwith longitudinal; channels 1 andiaj division platl lZ seted at its in these hannels and having the side plates 8 secured thereto a'sfjat 13, provides ta'ining' these side pl ates in proper "spaced frain'e'forniing relatioiiand at the same time divides the channelsll into upper anda-lower' rooves is" which extend throughout the ill length of the division plate, and around the ends thereof. 7 p

The dogs proper are carried by and arranged for movement in the frame 4t, such comprising an endless series of movably connected links 15, having lateral rollers 16 to seat in the grooves 14: and guide such links in their movement in the frame l. Certain of the links 15 are provided with upstanding dogs 17, preferably arranged in pairs with their extreme upper ends formed for biting engagement with the log. It will of course be understood that the dogs proper are thus designed for travel'in an endless path within the plane of the frame 4, and that the uppermost dogs, at the particular moment of operation, are the ones that will engage the underside of a log. I In this connection and with particular -.referen'oe to Fig. 4, it will be noted that the dogs 17,

when in operative position, project some distance above the biting edges 9 of the frame side plates 8, to thereby provide two distinct and effective ranges for the under dogging means, as will be hereinafter pointed out. s

From the above description, i will be apparent that the frame a is designed for a pivotal or up and down swinging movement with respect to the carriage, that is, with respect to a log, while the dogs proper are capable of a free travel in an endless defined path within such frame, with this line of travel substantially at right angles to or generally across a logron the carriage. The swinging movement of the frame is designed for and utilized to force the dogs into biting cooperation with the log, while the independent movement of the dogs proper is designed to compensate for the adjustment of the 10 on the carria 'ethrou h movement of the a w J, a: a

'lhererore, the operation of the knees. frame to cause the dogs to bite into the log should be capable of manual control at will, while the compensatory and independent 7 movements of the dogs'proper should be more or less automatically takencare of at the time the knees are moved.

'lo provide for operating the frame 4 and therefore causing thedogs and frame edges .9 to bite into the log, links 18 dependfrom the frame and are connected by a crank arm 19 to, a shaft 20 suitably mount-ed belowjthe' forward portion of the carriage. A second crank arm 2lrproject-s from the shaft 20 and is connected to a piston rod 22 having a piston 23 operating in a cylinder The cylinder is formed with appropriate portsfor the admission and relief of fluid (preferably air) under pressure, wherebythrough obvious movement of the piston 23 in one direction or the other, the dog frame l will be moved upwardly or downwardly on its pivotal support ti. as the dog p opeiyin st ha t e ce e- .log, it is apparent that this compensatory movement of the dogs should take place at the time the knees are moved, and may, if desired, be controlled directly in the movement of the knees. For example, as a means of carrying out this movement, one or more f the links 15 may be provided with a bar extension :25 moi ably connected to a rod 26, which. latter extends from one or the other of the knees. Thus, as the knee with which the dogs are connected is moved, the dogs are correspondingly moved in the frame 4-, and hence adesired relation is maintained between the knees and dogs. It is of course apparent to any one skilled in this artthat the dogs need not be moved directly by the knees in order to provide the; compensatory movementreferrd to, as the dog moving elementlnay be operated directly from the usual set shaft, by any preferred type of gearing or connections, and under these circumstances the compensatory movement of the dogs will still be in desired relation to the movement of thelrneesJ In the operation of the preferred form, after the log is in position, pressure is mitted to the cylinder 24- to rock the shaft 20 and move the crank arm 19 in the direction of the arrow, Fig.3, whereupon the frame l is moved upwardly to cause the dogs to bite into the log. If the bark on the log is thick, or the log unusually heavy, the dog 17 will pass through the bark and into the more solid part of the wood structure, while the biting edges 9 of the side plates 8 penetrate the bark to a greater or less degree. The log is thus positively held against endwise movement relative to the carso by two distinctive dog holding ele- .nents, each vhaving its own penetrating depth, and these penetrating depths being at different levels. Under ordinary circumstances. that is, with ordinary logs, the frame is so operated that the dogs 17 alone penetrate t 19 log for'holding purposes, but where the log is unusually heavy, or the bark on the log unusually thick, advantage is alren of both the biting edges 9 and the dogs 1?, as were the dogs alone used, the penetration might not be entirely through tb heavy bark on the log, and hence the log would not be effectively secured.

l. er the log is engaged with the under log doggingmeans as described, and the knees are subsequently adjust-ed, either to meet ordinary sawing conditions or for tapering the log. the dog links'15 are moved 'at the time the knee is moved and in a similar direction to more or less compensate for this log movement, without interfering with the. relation between the logaiul mclerlog d gg g means ether ,9 e

biting cooperation, on in: a subsequent move? be apparent that at no time can the dogs reach a position across the saw line, for the dogs are compelled to travel in a predetermined path in the frame, and this path terminates short of the saw line.

In the preferred form described, the dogs proper are positively moved at the time the knee is moved, and While this construction is advantageous to meet all logging conditions, yet nevertheless under some such conditions the dogs may be left free and moved only through and by the movement of the logs as the knees are adjusted. Such a construction is illustrated more particularly in Fig. 6, where the frame 4 is similar to that described in the preferred form and is designed tobe operated in the same or a similar manner. he dogsof this preferred form however,- are shown at 27 as projecting from the links28 of an endless chain 29' adapted to travel the grooves 30 int-he side plates of the frame 4: which correspond to the grooves 14 of the preferred foi'in- Here, a'sthe log is moved under the adjustment of the knees, the dogs 27, by reason of the freedom of movement of the chain 29, follow the log, thus effectiveiy maintaining a dogging means which automatically compensates for theadjustment of the log, without however, having any fixed means for operating the dogs proper to provide such compensation. The continuous chain in this modified form is obviously moved by the log in one direction only, for when the under dogging means is withdrawn from the log, and the knees returned to normal position, the dogs remain stationary. However, this is no" disadvantage in the eii'ective operation of this type for the dogs are arranged in endless formation, under which circumstances a certain proportion of the dogs will be at all times in position to engage a log when the frame 4: is operated.

A further modified form of the invention is shown in Fig. 7, in which form the in dependently movable dogs are dispensed with, and the dog compensation for log movement provided for ina different manner. Inthis form, the dogging means comprises a bar or plate Slpivotally supported 7 upon a bracket 33, corresponding to the bracket h of thepreferred form, the bar 31 being operated. by links hconne'cted to tliecra'nk arm? 19 of-the preferred means of operation. Tins the bar 31 is in efect the same: as the original. frame: i; The upper edge of. this bar is: sharpened? to a biting edge: 35;. andisu'ch ledge is undulating length:

wise; the same; as: indicated {at 36; The termin'al. of; t-heiedge has the biting; projection:

preferred form. Inthe operation of this modified form, the biting edge 35 is forced into the log to hold the same against relative endwise movement, exactly are the dogs of the preferred form. In the movement of the loghowever, intheadjustment of the knees, compensation between the under doggingmeans of this form and the log is permitted to the undulating biting edge of this dogging -member, which perm'i'ts the log to roll or move over such biting edge without separating such edge from the log. Thus, as in the preferred form, the movement of the log is compensated for without disturbing the biting cooperation of the dogging means with the log.

I have stated that the link dogs may be operated from the set shaft or from or in connection with the setting mechanism. For

reasons which may arise-in practice, it may be found advisable to have the link dogs move slightly differentspeedth'an that ofv the knee, and in order to meet this condition, the necessary means to'accomplish it can very readily be operated by the setting mechanism. Therefore, it is to be unden stood that where the phrase occurs moved in unison with the knee or timed to move with the knee contemplates movement of the dogs at the same speed as or at a diiferent speed from that ofthe knee.

Great difliculty and loss is experienced in sawing logs through the logs slipping or shiftingendwise on the carriage. This action is due to the momentum of the log in the reciprocal movement of the carriage, and when it occurs, it frequently bends the knee dogs or disengages them from the log and throws the latter out of alignment With the knees and the saw line. Because of the irregular shape of the ends ofma ny logs, they roll on the carriage When the knee dogs be come disengaged, hence the log is liableto assume any but the position determined by the setter. In many instances, the shifting ofthe' alignment of a log is not great enough to be noticeable to the setter or Sawyer, and herein lies one of the essential reasons-why a log should be positively held up against the knees.

I have discovered that by dogging a log on its underside, and arrange these'dogs to take hold in the same relation to" the kneesin their movement on the blocks. endwise movement or slipping is prevented, and atv the same timethebiteofftliedogs in the logho'lds' it against' rolling, which materially increases production and in'iprovesthe grade ofilumber.

While not absolutely essential, I havealso discovered: that if liln'k or s'i-milar dogs: are

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located: at a point" or points between the Theusual knee dogswhen used alone grip 'a log in such a manner that the weight of the knee dogs, is prevented. That is to say, i

the link dogs insure against slipping, thus, once a log is held by the knee and linkdogs, its position is fixed against the knees and a predetermined saw line is maintained.

From the description of the construction and operation, it will be seen that I have provided means to effectually overcome the ,Cllfl'lQHlillGS heretofore outlined, and that the means so provided will positively hold a log in set position on a carriage.

It is to be understood that while I have illustrated and described the frame 4 as mounted for a swinging movement relat-ive to the carriage, this particular type of move ment is not necessarily essential to the proper operation of the dogs, as, the frame may, with equal facility, and by simple mechanical changes not necessary toillustrate, be made to slide bodily up and down in order to force the dogs into cooperation with the log or withdraw the same. Therefore, the swinging movement of the dog frame herein described andv illustrated is intended and designed to cover any movement of the dog frame by which the dogs may be forced into and withdrawn from the log.

Furthermore, the dog frame is here described as operated from a pressure cylinder through intermediate rod and link connections. 'This illustration is merely for con venience in locating the parts, as it will be understood that the piston of the cylinder may be connected directlyto the frame, and the cylinder located directly below the frame, so that the latter may be operated, so to speak, directly from the cylinder, without the use of intermediate connections.

Vhat I claim is:

1. In combination with a saw mill oarriage, knees thereon, dogs associated with each knee, and means including a dog having a support upon-the carriage independent of the knees and located between the knees and extending across the path of the underj therefrom to engage a log,

dogs having a support upon the carriage a lo when su orted on said carria e do s mounted in the frame means for moving the dogs to engage the bottom of a log when up agamstthe knees, and means to cause the knees and the dogs to move together when setting a log. I

4. In combination with a saw mill carriage, knees mounted thereon, a frame mounted independently of the knees, a plurality of dogs mounted in the frame and movable with the knees, and means for operrating the dogs to cause same to engage a log.

5. The combination with a saw mill carriage, knees, a dog frame movably mounted on the carriage, a plurality of connected links operable and guided in the dog frame, certain of the links having dogs extending means to cause the links to move in the dog frame at the time a knee is moved, fluid pressure means for actuating the dog frame to cause the dogs to engage a log, and means for controlling the action of the fluid pressure means.

6. In combination, a saw mill carriage, knees thereon, a dog having a sup )ort upon movable in advance of the knees and at the timethe knees move'and normallyout of the path of the bottom of a log supported on the carriage, and means on the carriage,

dogs movable with and in advance of the knee. means 011 the carriage independent of the knee for supporting and guiding the dogs and preventing the said dogs extending over the path of movement of the saw, and means on the carriage for actuating the dogs to engage a log.

8. In combination, asaw mill carriage, a knee movable thereon, a dog carrier mounted onthe carriage, flexibly connected dogs movable in the carrier, a connection between the dogs and knee, and means for operating the carrier to actuate the dogs with respect to a log, said carrier being formed to maintain a predetermined path of travel of the dogs in the movement of the knee. w

9. In combination, a saw n 'ill carriage, a knee movable thereon, a dog carrier mounted on the carriage, flexibly connected dogs movable in the carrier, a connection to cause the d g in e ihe lane ees-easier the carriage independent of the mees and operating the carrier to actuate. the dogs with respect to a log, said carrier being formed to maintain a predetermined path of travel of the dogs in the movement of the knee and to limit this path of travel in wardly of the path of movement of the saw.

10. In combination, a sawmill carriage, a knee, a movable dog having a support upon the carriage independent of the knee and extending in the path of a log to be oper ated upon and movable at the time the knee is moved, and, means for operating the dog to engage a log.

11. In combination with a saw-mill carriage, a knee thereon, a dog mounted on the carriage and having a support upon said carriage independent of the kneeand extending acrossthe path of a log, and means to -cause movement of thedog at the time of movement oi theknee.

12. Ii -combination with avsaw' mill carriage, a knee a. dog-mounted onthe oarriage and having a support upon said carriage independent of the knee, means for causing the dog to move acrossthe path of a log at the time the knee is moved, and means for; operating the dog to engage a log.

13., In combination with a saw mill .carriage, knees on the earriage, a, dog having a support upon the carriage independent of the knees and extending across thepath of a login advance of the knees, said doghaving log engaging elements at different levels, means for causing certain of the log engaging elements to move across thelineof; the log at the time one of the knees is moved while others maintain their original positiomand means for actuating the dog to engagea log.

1 1. Ina saw mill carriage, an'under log (logger, comprising-doggingmeans for engagement with the log when the latter is against the knees in position-for sawing,-

and at all timeseiiective throughout the full, adjustment-range of the knees and movable into and out ofengagement with the under surface of the-log and having an independent movement to compensate-for log adjustment by the knees.

15, In a saw mill carriage, an under log dogger, comprising dogging means for engagement with the log when the latter is against the knees in position v, for sawing, and adapted for swinging movement relative to the carriage to and'from biting engagement with the log, said dogging means having a support upon the: carriage independent of the knees andhav ng an independent movement to compensate for log.

adjustment by theknees.

16.;In1a saw millcarriage,thecombination with an under log doggei comprising dogging- 'means, arranged beneath and transversethe log position on-the carriage for engagement with the leg when the latter is against the kneesin position for sawing, said dogging means having an effective range throughout the full'adjustment of the knees, of means for moving the dogging means relative to the log for dogging the same, and means to permit an independent iovement of the dogging means to compensate for the log adjustment by the knees.

17. The combination with a saw mill carriage of an under log dogger for engagement with the log when the latter'is against the knees in position for sawing, and movable to and from the logior dogging purposes, and having a dogging range for substantially the full distance intermediate the saw line and the retracted positions of the knees, said dogging means having an independent movement to compensate for the movement of the log under any adjustment.

18. The combination with asawnmill carriage of an under log dogger for engagement withth'e iog when the latter is against the knees in position for sawing, comprising dogging means mounted for movement relative to the carriage and having an etiective range 101; dogging purposes substantially equal at ail times to the distance between the saw llneand the fully retracted positionsof the knees, said dogging means permitt-ing independent movement ofthe-log under any adjustment without interfering with the bite of the dogging means.

19. The combinationwith a saw mill carriage of a plurality of interconnected dogs mounted on the carriage and independent of the knees and operative in a substantially straight line undera. log on the carriage, meansto operate the plurality ofinterconnected dogs for biting operation with respect to the-log,.and means tooperate the plurality of inter-connectedv dogs at the time the knees are moved for log adjustment to maintainthe dogging aetion without regard to the log. movement 'undersuch' knee adjustment.

'20. An under log dogger for mill. carriages, comprising a'plurality of inter-connected dogs mounted on the carriage and operative in asubstantially straight line under a logpositioned on the carriage, said plurality of inter-connected dogs being adapted for movement to and from the log position for dogging operation and independently movable with the log after dogging operation in those movementsjoif the log responsive to knee adjustment.

21. An under log dogger mounted] to swing on the carriage independently of the knees, said dogging. means being furtherv mounted. for bodily movement toward and from the saw line concurrently ,withthe adjustment of the knees.

22. An under log dogger mounted to swmg on the carriage independently of the knees said dogging means being further mounted for bodily movement toward and from the saw line concurrently with the adjustment of the knees, said bodily movement of the dogging means being effective to engage the underside of a log at all times for the entire distance between the saw line and the face of the knees.

The combination with a saw mill carriage, of an under log dogger for engagement with a log when the latter is against the knees in position for sawing, and operative to and from the log, said dogger being mounted for an independent movement to maintain the dogger in biting engagement with the log during adjustments of the log by the knee, said dogger being effective at all times for the entire distance between the saw line and face of the knee.

2%. An under log dogger for engagementwith a log when the latter. is against the knees in position for sawing having clogging means movable to and from the log for dogging action, said dogger including an additional dogging means relatively movable to compensate for log adjustment by the knees, said additional dogging means having a permanent path of travel equalling at least the full possible adjustment range of the knee.

25. An under log dogger for engagement with a log when the latter is against the knees in position for sawing having dogging means movable to and from the log for dogging action, said dogger including an additional dogging means relatively movable to compensate for log adjustment by the knees, said respective dogging means having varying penetrating depths in doggmg action;

26. An under log dogger having independent dogging means arranged transverse the position of the log on the carriage, means for swinging both said dogging means for dogging engagement with the log, and means for operating one of said dogging means at the time the knee is adjusted to compensate for resultant log movement 27. An underlog'dogger having independent dogging means arranged transverse the position of the log on the carriage,

meme

29. A doggingmeans, comprising a frame supported on a saw mill carriage below a log for movement toward and from the log to be dogged when against the knees, and a plurality of dogs movable with and slidable in said frame. r

30. A dogging means, comprising a frame supported on a saw mill carriage below a log for movement toward and from the log to be dogged when against the knees, and a plurality of dogs movable with and having a predetermined path of travel in said frame.

31. A dogging means, comprising a frame supported on a saw mill carriage below a log formove'ment toward and from the log to be dogged when against the knees, and a plurality of dogs movable with and having a predetermined path of travel in said frame, said path of travel being defined by and within the limits of the frame.

32. A dogging means, comprising a frame supported on a sawmill carriage below a log for movement toward and from the log to be dogged when against the knees, and a plurality of dogs movable with and in said frame, said dogs projecting above the frame for dogging operation.

33. A dogging means, comprising a frame, having integral dogging edges, and a'plurality of independent dogs movable with and in said frame.

3a. A dogging means, comprising a frame, having-clogging edges, and independent dogs movable in said frame, the operative ends of the dogs extending beyond the dogging edges of the frame.

35. A doggingmeans, comprising a frame supportedon a saw mill carriage below alog for movement toward and from the log to be dogged when against the knees, said frame, having guideways, and a plurality of dogs freely slidable in said guideways.

36. A dogging means, comprising a frame supported on a saw mill carriage below a log for movement toward and from the log to be dogged when against the knees, said frame having spaced side bars formed with guideways, and a plurality of connected dogs freely slidable in said guideways.

37. A dogging means, comprising a frame supported on a saw mill carriage below a log for movement toward and from the log to be dogged when against the knees, said frame being formed with guideways, and a plurality of connected dogs freely slidable in said guideways, said guideways limiting the movement of the dogsto within the v length of the frame.

38. In combination with a saw mill carriage, knees, dogs mounted to move with the knees and located in advance of the same to engage the bottom of a log, said dogs having pivotal connection with the carriage independent of the knees and operated to engage the log through movement on said pivotal connection, and means for operating the dogs.

39. in combination with a saw mill carriage, knees mounted thereon, a dog frame pivoted on the carriage and extending across the path of a log when supported on the carriage, dogs slidably mounted in the frame, and means for tilting the frame on its pivot to cause the dogs to engage in the bottom of the log when up against the knees to prevent lengthwise movement of the log.

40. In combination with a saw mill carriage, knees mounted thereon, a dog frame pivoted on the carriage and extending across the path of a log when supported on the carriage, dogs slidably mounted in the frame, means for tilting the frame on its pivot to cause the dogs to engage in the bottom of a log when up against the knees to prevent lengthwise movement of the log, and means to cause the knees and the dogs to move together on the carriage when setting a log.

41. A saw mill carriage, knees thereon, an under log dogger comprising a frame mounted on the carriage independently of the knees and extending substantially transverse the length of a log from a normal knee position to a position short of the saw line and movable toward and from the log and provided with log engaging means, and means whereby said frame may be operated to cause said engaging means to engage the underside of a log to hold said log against endvvise movement notwithstanding the movement of the log toward the saw line through movement of the knees.

In testimony whereof I affix my signature.

FREDERICK E. MARTIN. 

